/u/[deleted]'s posts in /r/askscience
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Why are some noises (rain, flowing water, a rotating fan) soothing to humans? Are these same sounds soothing to other animals?
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Shouldn't we expect given what we know about natural selection that the lifelong twice daily use of mouthwash would create enormous evolutionary pressure on the oral bacterial fauna? If one were to stop wouldn't this leave behind much tougher, difficult to deal with bacteria for the body?
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